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I recently received the error "engine malfunction" and the car went into reduced power mode. This only happened when the car was on reserve fuel. Does anyone know if this was due to the stage 1 tuner obviously increasing the fuel rate? The warning went away after I fueled up?

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I would send terry an email. Have you been tracking your fuel economy?

I have a 2010 750Li with a BMS Stage 1. I'm out of factory warranty, but have an aftermarket warranty. I intend to continue to use the Dealership for maintenance.

Question - Since it is out of factory warranty, do I need to remove the BMS Stage 1 when I take it in for routine maintenance, or can I leave it in and they wonít care, because it is no longer under factory warranty? I've already snapped off one of the retainer clips last time I had to take it in, and donít really want to have to take it out again. Anyone have any experience with this? Apreciate your responses.

I have a 2010 750Li with a BMS Stage 1. I'm out of factory warranty, but have an aftermarket warranty. I intend to continue to use the Dealership for maintenance.

Question - Since it is out of factory warranty, do I need to remove the BMS Stage 1 when I take it in for routine maintenance, or can I leave it in and they wonít care, because it is no longer under factory warranty? I've already snapped off one of the retainer clips last time I had to take it in, and donít really want to have to take it out again. Anyone have any experience with this? Apreciate your responses.

There is really no exact answer. Some have even had their dealership install the BMS. I would guess that it would be fine to leave it in. You could call your SA and ask him "if" you got a BMS tune, would it have any barring on a third party extended warranty?